Amazon mollies don't need a man, and never will. A new study finds they can purge and repair genetic mutations that would ...

Siamese fighting fish are popular pets, but experts say they require a lot of preparation and care. Here's what families need to know. Betta fish are popular but they are not easy starter pets, so ...

The Amazon molly is an evolutionary enigma: an all-female fish that reproduces by cloning itself. Because it doesn’t mix its DNA with a mate’s, Darwinian logic holds that harmful mutations should pile ...

The Atlantic sturgeon was driven to extinction in Europe by the middle of the 20th century. In Sweden’s Göta River, a ...

For decades, ecologists have known that how a species looks or eats affects its environment. But a new study by researchers at the University of California, Santa Cruz, shows that social behavior ...

When closely related species mate, their offspring sometimes survive but cannot reproduce. This pattern often affects males ...

Most people know only two things about the appendix: You don’t need it – and if it bursts, you need surgery fast. That basic ...

Being right- or left-handed is a familiar fact about yourself you likely don’t think about much on a day-to-day basis. However, your handedness affects how you interact with the world. For many people ...

Wild orcas across four continents have repeatedly floated fish and other prey to astonished swimmers and boaters, hinting that the ocean’s top predator likes to make friends. Researchers cataloged 34 ...

Salt River Project stocked a section of the Grand Canal in Phoenix with 2,500 white Amur fish. The fish eat weeds and other aquatic plants that could clog water intake equipment. The fish are less ...

Being right- or left-handed is a familiar fact about yourself that you likely don't think about much on a day-to-day basis. However, your handedness affects how you interact with the world.

Scientists have uncovered a surprising new way that giant embryonic cells divide—without relying on the classic “purse-string” ring long thought essential for splitting a cell in two. Studying ...